Angelina Jolie & Brad Pitt -- Still Golden ... After All These Years

Angelina Jolie and Brad Pitt STILL clean up so freakin' good, it hurts -- and they flaunted their perfection Thursday night at the Hollywood premiere of their movie "By The Sea."

Angie directed, wrote and co-stars in the film with Brad so this was clearly a big night for the couple, who apparently REFUSE to age.

She's 40, he's 51, and they have 6 six kids running around at home, and the thing is ... none of that shows, AT ALL!